docs: def _different(left, right, f):
      """
      true if entry f is different between left and right ZipFile
      instances
      """
  
      l = left.getinfo(f)
      r = right.getinfo(f)
  
      if (l.file_size == r.file_size) and (l.CRC == r.CRC):
          # ok, they seem passibly similar, let's deep check them.
          return _deep_different(left, right, f)
  
      else:
          # yup, they're different
          return True